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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class The following schedule details inventories by major class ($ in millions):
March 31,
2021
December 31,
2020
Raw materials$65.2 $65.3 
Work in process24.6 23.2 
Finished goods75.5 83.5 
Supplies and other8.0 7.7 
Total$173.3 $179.7